摘要
方法在研究不同压力气藏含气浓度及盖层生烃能力封闭特征的基础上，分析了不同压力气藏的天然气扩散作用的特征。目的评价气藏中天然气扩散损失量及其保存条件。结果高压气藏中的天然气扩散散失作用强，只有上覆盖层具更高的含气浓度时，方可阻止其天然气的向上扩散散失；常压气藏在通常情况下，其天然气向上扩散散失，但在上覆盖层具较高含气浓度时，也可阻止其天然气的向上扩散散失；低压气藏中天然气的向上扩散散失已被抑制，保存条件好。结论不同压力气藏具有不同的天然气扩散特征。
Method\ Based on the study of gas concentration, hydrocarbon generating capability
and trapping features, gas diffusion characteristics in different pressurized gas reservoirs are
analyzed. Purpose\ To evaluate gas diffusion loss and its trapping conditions. Result\ Gas
reservoir with high pressure shows strong tendency of upwards diffusion except that whose cap
rock presenting higher gas concentration; This tendency is also inhibited in normal pressure
gas reservoir if its cap rock has relatively higher gas concentration. Same inhibition presents in
low pressurized gas reservoirs due to their good trapping conditions. Conclusion\ Gas
reservoirs at different pressures have different diffusion characteristics and various diffusion
loss and trapping conditions as well.
出处
《特种油气藏》
CAS
CSCD
1999年第1期1-5,共5页
Special Oil & Gas Reservoirs
关键词
天然气扩散
油气运移
压力
气藏
gas diffusion, gas concentration, high pressure
gas reservoir, normal pressure gas reservoir, low pressure gas reservoir
